Traefik + Let's Encrypt

Important: Please read the migration guide.

CVE fixed:

• CVE-2026-54763 (Advisory GHSA-x677-9fxg-v5c5)
• CVE-2026-54764 (Advisory GHSA-3q9r-p662-5j8m)

Bug fixes:

• [acme, logs] Bump github.com/go-acme/lego/v5 (#13154 @ldez)
• [acme] Bump github.com/go-acme/lego/v5 (#13359 @juliens)
• [k8s/gatewayapi] Add missing Gateway API features in conformance tests (#13356 @AnatoleLucet)
• [k8s/gatewayapi] Ignore other gateways parentRefs and update route parent statuses only for managed gateways (#13397 @rtribotte)
• [k8s] Detect EndpointSlice condition changes (#13405 @kevinpollet)
• [k8s] Index Kubernetes EndpointSlice by service name (#13395 @kevinpollet)
• [k8s] Sort endpointslices to keep backend IPs consistent across rebuilds (#13406 @kevinpollet)
• [kv] Bump kvtools/redis to v1.2.1 (#13403 @ldez)
• [middleware, authentication] Fix x-forwarded-port in forward-auth (#13344 @juliens)
• [middleware, k8s/gatewayapi] Fix Host header not being modified by RequestHeaderModifier (#12805 @mihuross)
• [middleware, k8s/gatewayapi] Fix request scheme derivation when Gateway API RequestRedirect omits scheme (#13347 @gndz07)
• [middleware] Fix CORS Max-Age set to 0 by default (#13371 @AnatoleLucet)
• [middleware] Fix CORS wildcard when allow-credentials is true (#13368 @AnatoleLucet)
• [tls] Fix nondeterministic TLS certificate selection on shared SAN (#13348 @rtribotte)
• [server] Add an option to remove request headers with underscores (#13262 @youkoulayley)
• [server] Configurable max request header size (#13353 @juliens)
• [webui] Bump axios to v1.18.0 (#13380 @gndz07)
• [websocket] Fix connection upgrades when backend server is using h2c scheme (#12967 @stffabi)

Documentation:

• [k8s] Align Helm chart documented values with chart v41 (#13366 @mloiseleur)
• [k8s/crd] Fix broken CRD reference links in IngressRoute page (#13375 @s3onghyun)
• [k8s/ingress-nginx] Add Kubernetes Ingress NGINX to the providers list (#13372 @nmengin)
• [middleware] Clarify entryPoint middleware reference format (#13364 @mloiseleur)
• [security] Add HTTP/2 header memory exhaustion security documentation (#13381 @emilevauge)
• [server] Adds documentations on maxHeaderBytes (#13363 @juliens)
• Fix inaccuracies in reference documentation (#13304 @sheddy-traefik)